Rolls for rolling hoop-iron and tube-skelps



HOQRAFHER AsHmGToN D C 2 Sheets-Sheet 1. N. KING.

- Rolls for Rolling Hoop Iron and Tube Skolps.l

No. 231,493. Patented Aug. 24, 1880.

WMI

2 Sheets- Sheet 2.

N. KING.

ube Skelps.

Aug. 24,1880.

Rolls No 231 for'Rollivng Hoqp Iron and T ,493. Patented l?? Va 7? Zag?? rya 2126];

NPETERS. PHOTO-LITHUGRTPHER WASHINGTON. D C.

llNrrsn STATES PATENT OrrrcnO Hw .o

NORMAN KING, OF SHARPSBURG, PENNSYLVANIA.

ROLLS FOR ROLLING HOOP-IRON AND TUBE-SKELPS.

SPECIFICATION formingpart of Letters Patent No. 231,493dated August 24, 1880.

Application filed April 22,1879.

To all whom Lt may concern:

Be it known that I, NORMAN KING, of Sharpsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in the Manufacture of Square-Edged Hoop-Iron and 'Iube-Skelp; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification, in which- Figure I exhibits my invention as applied to the manufacture of tube-skelp. Fig. 2 exhibits it as applied to the production of squareedged hoop-iron. Figs. 3 and 4 respectively represent the section after each pass. Fig. 5 shows modications in the form of fillet. Fig. 6 exhibits the wear and manner of repairing the old form of rolls. Fig. 7 shows a two-high continuous train of rolls.

My invention relates to the manufacture of scar-fed and square-edged hoop-iron by rolling and alternately beveling two adjacent edges of the slab in suitable grooves, and in the intermediate passes subjecting said beveled edges to the squaring action of a plain roll.

My invention consists specifically in the combination of a plain cylindrical roll with two fiat grooved rolls flleted and graduated, whereby the reduction and finishing of the slab may be effected, as hereinafter described.

Ordinarily rolls for hoop and scarfed tube iron are made with tongues on one roll fitting grooves on the other or others, the workingpasses being locatedbetween these tongues and grooves. The objection to this is the difficulty of chilling the roll properly and preventing the edges of the tongue-grooves from scaling e and chipping off, and the fillets, if any are used, are at the finishing-pass, thus leaving all the molding of the edge to the last, when the metal is least capable of taking it. The consequence is that the finished article presents a rounded edge, which frequently exhibits transverse cracks and is not suitable for all purposes. Besides, the tongue and groove rolls inevitably tend to form a lin on the metal, which in the finishing-pass is difficult to roll down, and when so done the quality, or rather the texture, of the iron is imperfect. When, after continued use, these tongued rolls wear too large, as shown in Fig. 6, it is necessary to dress them or throw them away. To dress them, on account of the tapering form of tongue and groove, and the wear which takes place being of an undercut nature, there is but one way to proceed-namely, to deepen the groove till the tapered sides cut beyond the worn portions, and then reduce the face of the roll to allow the tongued roll to fit into the grooves.

In Fig. 6, X shows the rolls after becoming' worn. Y shows the newly-dressed groove, the dotted line showing where the face of the roll must come off, and Z shows the dressed rolls in position.

It can be easily seen how such treatment weakens the grooved rolls, and how the dressing throws the working-face of the grooves inside the pitch-line, causing dragging of the pinion and a tendency to throw the slab.

On account of the practice of giving the finished form at the last pass or two in hoop and scarfing rolls, none but good quality of metal can be successfully used because of the stated tendency to crack and round off at the edges.

The object of my invention is to produce a perfect finish without rounded or cracked edges, to eHect it on any quality of iron or steel,to repair or dress the rolls without weakening them, and to be able to change the gage of a three-high by taking out and substituting only two of the rolls.

To these ends I proceed as follows: I construct the mill with one plain cylindrical roll, A, and two grooved rolls, B C, one or both of which have the llets a in the bottom corners of the grooves, the grooves corresponding to each other on the two rolls.

For scaring tube-iron both rolls B C are filleted as in Fig. l, and the action is as follows: In pass 1 the slab is beveled off on all its corners, the metal being then at welding heat and taking the bevel without cracking. In pass 2 the section is reduced, and two adjacent edges fill out to a sharp square by the action of the plain roll. In pass 3 the slab is again doublebeveled, and in pass 4 half-squared again, as in pass 2. The same successive actions take place in passes 5 and 6. Pass 7 puts double-beveled knife-edges on the slab, and pass 8 produces the searfed finish for tubeskelps. The molding of' the edges is thus begun when the iron can take it without cracking or rounding, and this successive kneading, as it were, keeps the grooves well filled, resulting in sharp finish and no cracks; hence an inferior quality of metal can be used.

For rolling hoop-iron I construct, as in Fig. 2, one roll, A,being (as before) plain, one, B', grooved and filleted, aml one, C', squaregrooved. Fig. 4 shows the sections of the passes, where it will he seen that the same kneading process is practiced alternately on two edges, producing similar results.

When it is desired to change the gage or forni of product l have to remove and substitute for only the two grooved rolls, the plain roll being adapted to all styles and shapes which the rolls are capable of' making. This, of course, saves much labor.

By method of gradually lineading up the edges af'ter giving them an impetus in the tn-st groove, and alternating' the directions, I am enabled t0 work up any quality of metal to a perfect finish.

When the grooves wear too large I need but Widen them to the next gage, and I have a practically new set of rolls, as I do not reduce the diameter, and consequently, after dressing, the rolls are as strong as ever.

It is obvious that the plain roll may occupy any position in the housings relatively to the others.

It is equally obvious that the fillet may take various forms-the angular, as in Figs. 1 and 2, or the concave, convex, or beveled, as in Fig. 5.

It is likewise clear that my method of' reducing may be practiced on a two-high continuons train by combining in each pair a plain and a grooved and lleted roll, and so arranging thel pairs successively that the bevel ef'- fected in one pair shall be squared in the succeeding pair, and so on. The same advantages as to dressing and change ot' gage and f'orm will be found here as in three-high rolls.

I claim as my invention- In hoop and scarf'ed iron rolling mills, the combination ot' a plain cylindrical roll, A or A', and two flat grooved rolls tilleted and graduated, substantially as described.

In testimony that I claim the foregoingl have hereunto set my hand this 12th day ot' April, 1879.

NORMAN KING.

IVitnesses:

H. F. DUNHAM, G. II. IlouN. 

